Patents by Inventor John A deVos

John A deVos has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20070097478
    Abstract: Embodiments including a charge responsive optical material are disclosed.
    Type: Application
    Filed: October 31, 2005
    Publication date: May 3, 2007
    Inventors: Roshan B. Baliga, Timothy D. Emmerich, Peter J. Fricke, Richard Aufranc, John A. Devos, P. Guy Howard
  • Patent number: 7201782
    Abstract: A gas generation system includes a chemical reactor configured to produce a gas from a continuous flow of aqueous solution, and includes a pump configured to control the flow of the aqueous solution through the chemical reactor to control a production rate of the gas.
    Type: Grant
    Filed: September 16, 2002
    Date of Patent: April 10, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: John A Devos
  • Patent number: 7130118
    Abstract: An enhanced-contrast projection screen and method of controlling such screens are disclosed. An embodiment of a dynamic projection screen includes a passive layer and at least one active layer. The active layer is superimposed on at least a portion of the passive layer and is adapted to selectively toggle between being transparent and being opaque. A method of controlling such a screen includes determining desired dimensions of a reflective region, and activating at least a portion of an active layer superimposed on at least a portion of a passive layer. The active layer is adapted to selectively toggle between being transparent and opaque.
    Type: Grant
    Filed: August 6, 2004
    Date of Patent: October 31, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Rachel Fillmore Smythe, John A. Devos
  • Patent number: 7106208
    Abstract: A sensor/switching device configuration that includes a substrate and at least one element imprinted on the substrate containing an electroconductive material.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: September 12, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: John A. Devos
  • Patent number: 7042640
    Abstract: A projection screen unit includes a first projection surface optimized for a predetermined range of ambient conditions and a second projection surface optimized for a second, different range of ambient conditions.
    Type: Grant
    Filed: June 8, 2004
    Date of Patent: May 9, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: John A. Devos, Gregory J. May
  • Patent number: 7014112
    Abstract: A method of conveying information from an electronic identification label to an interrogator includes coupling energy from an external field into a resonant circuit of the electronic identification label. The method also includes the electronic identification label periodically storing and discharging an amount of the coupled energy wherein the period that the electronic identification label stores and discharges the energy conveys information about the electronic identification label to the interrogator.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: March 21, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: John A deVos, Chinmay Betrabet, Jian-gang Weng, Daniel Robert Blakley, Olan Way
  • Publication number: 20040217171
    Abstract: A method of conveying information from an electronic identification label to an interrogator includes coupling energy from an external field into a resonant circuit of the electronic identification label. The method also includes the electronic identification label periodically storing and discharging an amount of the coupled energy wherein the period that the electronic identification label stores and discharges the energy conveys information about the electronic identification label to the interrogator.
    Type: Application
    Filed: April 29, 2003
    Publication date: November 4, 2004
    Inventors: John A. deVos, Chinmay Betrabet, Jian-Gang Weng, Daniel Robert Blakley, Olan Way
  • Publication number: 20040202903
    Abstract: A production system includes a reaction chamber having an inlet and outlet, a gas collection chamber coupled with the reaction chamber and a regulator coupled to the gas collection chamber. The regulator controls the flow of reactant to the reaction chamber in response to the pressure in the gas collection chamber.
    Type: Application
    Filed: April 10, 2003
    Publication date: October 14, 2004
    Inventors: John A. deVos, Louis Barinaga, Suraj L. Hindagolla
  • Publication number: 20040052704
    Abstract: A gas generation system includes a chemical reactor configured to produce a gas from a continuous flow of aqueous solution, and includes a pump configured to control the flow of the aqueous solution through the chemical reactor to control a production rate of the gas.
    Type: Application
    Filed: September 16, 2002
    Publication date: March 18, 2004
    Inventor: John A. Devos
  • Publication number: 20040048115
    Abstract: A hydrogen generating apparatus includes a chemical reaction chamber, a chemical solution reservoir, an unpowered pressure-producing member for moving a chemical solution from the chemical solution reservoir to the chemical reaction chamber, and a distributed catalyst bed about the chemical reaction chamber.
    Type: Application
    Filed: September 6, 2002
    Publication date: March 11, 2004
    Inventor: John A. Devos
  • Publication number: 20030234172
    Abstract: A fuel cell cartridge including a thermally-initiated hydrogen fuel source where the fuel cell cartridge is configured to receive radio frequency energy for thermally initiating the fuel source to produce hydrogen gas.
    Type: Application
    Filed: June 25, 2002
    Publication date: December 25, 2003
    Inventors: Alan R. Arthur, Ravi Prasad, John A. Devos, Philip Harding
  • Publication number: 20030194369
    Abstract: A gas generation system includes a chemical reactor integrated with a liquid/gas separator. The reactor is configured to receive a continuous stream of aqueous solution.
    Type: Application
    Filed: April 16, 2002
    Publication date: October 16, 2003
    Inventors: Ravi Prasad, John A. Devos, Philip Harding, Joseph W. Tsang
  • Publication number: 20030194368
    Abstract: A hydrogen production system includes a reactor having an inlet and an outlet and a catalyst disposed in the reactor.
    Type: Application
    Filed: April 16, 2002
    Publication date: October 16, 2003
    Inventors: John A. Devos, Philip Harding, Ravi Prasad, Joseph W. Tsang